On Friday, March 3, 2017 at 1:12:39 AM UTC-5, Richard Feldman wrote:
>
> There have been various discussions of potential ways to improve Elm's
> record update syntax. Evan commented that "(examples > design work) at this
> point" - any potential designs for syntax improvements would need to be run
> through a gauntlet of examples to see how well they'd work, so the first
> step in the process is to gather those examples.
>
> So let's collect a ton of different real-world examples! That will help
> guide the design process.
>
> If you've run into a record update that you felt was painful and could be
> improved in some way, please post it here! (Also, *please keep this
> thread for posting of examples* *only* - it'll be easier to link back
> here during design discussions if we can reference a clean thread of
> examples, as opposed to a mismash of examples interleaved with suggestions.)
>
Hi all, Richard asked me to post to this thread based on a discussion we
had. Following along with some running themes here, I'm working with nested
Maybes, and combinations of Maybes with union types, which can quickly lead
to deeply nested patterns. Current code:
moveLeft : ExpressionTree -> ExpressionTree
moveLeft content =
case (activeBuffer content) of
Just buffer ->
case buffer of
BufferContent buffer ->
case buffer.cursor of
Just cursor ->
if Cursor.atStart buffer cursor then
content -- @TODO Shift last prev onto
current
else
-- ...
Nothing ->
content
_ ->
content
Nothing ->
content
Theoretical future code:
moveLeft content =
case activeBuffer content of
Just (BufferContent { cursor = Just cursor }) ->
if atStart buffer cursor then
content
-- @TODO Shift last prev onto current
else
-- ...
_ ->
content
Being able to destructure within a pattern match would save some extra
boilerplate.
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